Bull elk in sage brush with large rack of antlers during the fall rut (mating season). This bull elk has sparred with other bulls to establish his harem of females with which he hopes to mate.
Image ID: 19702
Species: Elk, Cervus canadensis
Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA

The Pronghorn antelope is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorns speed is its main defense against predators.
Image ID: 19626
Species: Pronghorn antelope, Antilocapra americana
Location: Lamar Valley, Yellowstone National Park, Wyoming, USA

The Pronghorn antelope is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorns speed is its main defense against predators.
Image ID: 19627
Species: Pronghorn antelope, Antilocapra americana
Location: Lamar Valley, Yellowstone National Park, Wyoming, USA